At the time the 33-year-old went missing, she was believed to be wearing a pink nightgown and possibly pink slippers.
Her boyfriend Joon Seong Tan, 35, of Doncaster, faced court via video link from custody last Friday after he was charged with her murder.
Mr Tan did not apply for bail and will next face court on July 16.
The body of Ms Zhang, also known as Kelly, has not been found.
Officers spent hours last Thursday searching waterways and parkland at Darebin Creek Reserve in Melbourne’s north-east for clues.
The investigation remains ongoing.
Anyone with information about Ju’s disappearance is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential online report at www.crimestoppersvic.com.au